Metal cap



My-z?, 1924. 1,495,324

C HAMMER METAL CAP F l d N 9 1922 Patented May 27, 1924.

L`Preis. f j

CHARLES HAMMER, QF. HOLLIS COURT BOULEVARD, NEW YORK.

METAL CAP.'

T 0 all whom t may concern Be it known that I, CHARLES HAMMER, a citizen of the United States, residing at Hollis Court Boulevard, in the county of Queens and State of New York, have invented certain new and useful Improvements in Metal Caps, of which the following is a specification.

This invention relates to closures particularly adapted for-'glass containers, such as jars or bottles, the object of the invention being to provide a-n improved metal cap which may be readily made of thin sheell metal having a reinforced flange or skirt provided at the lower edge thereof with instruck locking projections or lugs adapted to engage the external threads or projections of a glass container, whereby the cap may be readily applied to seal the container and readily removed, and in which the lcap flange will lie close to the glass conta-iner, the present invention being an improvement in part on my prior Patent No. 1,079,238 dated'November 18, 1913.

In that patent the skirt or flange is provided with a curled, beaded or rolled edge of hollow form which, when flattened to form the projections, results in a part thereof projecting beyond the outer wallk of the ange or skirt', while at the same time the formation of the locking lugs in the manner described in said patentsomewhat breaks the circular contour Aof the skirt. Moreover, in that patent the skirt above its lower edge is at no point of double thickness of metal, whereas in the present improved cap the skirt itself is not only of a double thickness of metal, but the formation of the locking lugs does not lso appreciably break the circular contour of the skirt so that the lower edge of the skirt has a less bulky appearance, and the cap flange will be closer to the neck of the glasslcontainer, while at the same time the lower edge is so formed that it will not cut the hands of the user nor be liable to corrosion.

In the drawings accompanying and forming a part of this specification, Fig. 1 isa side view of this improved cap: Fig. 2 is a bottom view thereof; Fig. 3 is across section taken on line 3 3 of' Fig. 1; and Fig. 4 is a detail View of a modification.

Similar characters of reference indicate corresponding parts in the several Aviews of the drawings.- y

In themanufacture vof this improved cap,

Application led November 9, 1922. Serial No. 599,758. v

a flat sheet metal blank of relatively thin i' material is first pressed or stamped into the form of a hat-shaped blank, that is, a blank having ay top 2 and a skirt or flange 3.. The flange or skirt of the blank isy preferably provided with an out-turned portiony or edge, although this may beinturned if des ired, and this out-turned or inturned por tion of the flange or skirt is pressed or rolled into position preferably on the `outside, so' as to hug'the flange or skirt as'at -5 of the cap, thereby forming whatmay be designated as a hemmedv edgeor flange 6. In practice this reinforcing portion'or edge will extend the desiredj distance upwardly of the flange or skirt, thereby to the extent of its height, providing a double thickness of wall around the entire skirt or flange.

The skirt or flange is then roughened, as by providingit with corrugations 7, which not only strengthen the cap, but facilitate its assemblage onthe jar as well as its removal therefrom, and these corrugations in one formof cap shown herein (Figsl to 3) are formedf in the double wall of the skirt will be observed that the reinforcing wall of the'cap stopsjust short of the corrugations.y v

Then, by means of the proper. pressure at while in another form (Fig. 4) thereof', it

spaced-intervals'around the lower edge of the cap, suitable locking projections or lugs 8 are formed from the double thickness wall of the flange or skirt, these projections or lugs extending inward'radially of the cap and in such manner that the circular contour of the flange at the'outside is not essentially departed from; In the present improved cap these projections are shown in the form of relativelyrshort lugs as distinguished from wedge-shaped projections or l threads, such as is shown 1n my contemporaneously pending application Serial No. 598,078, filed October 31, 1922, in consequence ofwhich the hemmed edgey or ange may also be corrugated, 'which it could not locking lugs, thus havingno'rawfloweredge to be attacked by acid and moisture, nor to out the hands of the user, and in which the general circular contour of the flange is not appreciably departed from, while at the same time the locking projections or lugs are of double thickness of metal, which double thickness of metal extends partially up the side wall of the flange or skirt, so that it likewise is reinforced, thereby strengthening the locking 'projections as well as the flange in addition to the strength which is given to these parts by the oorrugations, so that the. cap is strong and durable and is sufficiently rigid to withstand all of the pressure and strains falling thereon, and will meet all the requirements of a practical and commercial metal cap, and take up the necessary variations in glass jars or containers, especially since the formation of the vlower edge in the manner described herein enables the cap flange to be closer to the container threads, whether the flange be straight or have a slight outward flare at its lower edge, than is usually possible with a hollow beaded 0r curled edge, so that with the same size of lugs greater variation may be taken up in the container than has heretofore been practicable or where this is not necessary7 the lugs may have less inward projection to accomplish the same result, While at the same time it is neat and ornamental.

It will be observed that by reason of the reinforcing double wall of the cap flange which in a shallow flanged cap is shown eX- tending substantially half way up the depth of the flange and formed by a single bend of the ange at its lower edge, the locking lugs are stiffened so as to prevent the flange of the cap from being distorted in the drawing action on the container to such an eX- tent as to cause the top to buckle and the cap to be bent to any degree out of shape. In fact, the double wall thickness of the flange very materially prevents the bending of the cap out of shape, while enabling it however, to conform to any ordinary distortion or variation of the glass container or its projections or threads, and to be made of relatively thin sheet metal.

Thus, I have provided what may be properly designated as a hemmed edge cap having locking lugs formed from such hemmed edge, and which hemmed edge in one form thereof is also provided with strengthening corrugations, as a result of which'the formation of the locking projections does not cause the flange of the cap to materially depart from its circular formation, and in which cap the flange or skirt is relatively Shallow, as distinguished from what is known as a Mason jar cap, in which the flange is very deep, so that in this improved cap the locking lugs may engage the projections or lugs of the glass container relatively close to the top thereof.

Mameli In practice, a suitable form of liner usually used within the cap to effect an hermetic seal of the glass container.

' In the form of cap shown in Fig. il, the corrugations may be somewhat shorter in a shallow flange cap, and terminate short of the hemmed edge, and which, when they are outstruck, will thus more effectively break the appearance of this edge.

It will be understood that by describing in detail herein any particular form, structure or arrangement, it is not intended to limitl the invention beyond the terms of the several claims or the requirements of the prior art, since I believe I am the llrst to provide a cap with a reinforcing hemmed edge having locking lugs formed thereof, as well as a cap in which the hemmed edge is provided with corrugations.

I claim as my invention:

l. A metal cap formed of relatively thin sheet metal comprising a top and a depending skirt bentupwardly upon itself at its lower edge to closely hug said skirt and form a reinforced hemmed flange, the lower double edge of the skirt being bent radially inward at intervals to form short double parallel walled relatively flat locking lugs, the double parallel walls of the lugs providing increased resistance to distortion thereof and to the buckling of the cap top during the drawing down of the cap on to the container, and permitting the cap to be made of relatively thin sheet metal, the inner bent edges of the parallel walled lugs havl ing a rounded formation adapted to retain the lacquer and avoid a too sharp edge, and the said closely hugging portion extending a material distance above the plane of the points of junction of the lugs and the skirt.

2. A metal cap having a double walled depending skirt with corrugations, and inwardly extending locking projections formed from said double wall.

3. A metal cap formed of relatively thin sheet metal having a'depending skirt provided with a hemmed edge formed by bending the metal at the lower edge of the skirt upon itself, said hemmed portion being forced inwardly at intervals to form locking projections and pressed to form corrugat-ions therein.

4. A metal cap formed of relatively thin sheet metal having a depending skirt provided with a hemmed edge formed by bending the metal at the lower edge of the skirt outwardly upon itself, said hemmed portion being forced inwardly at intervals to form locking projections and pressed to form corrugations therein.

5. A metal cap having a depending skirt bent at its lower edge upwardly upon itself to closely hug said skirt thereby forming a double wall or hemmed edge, said skirt having corrugations in the double wall thererie of, and also having below the saine a plurality of inwardly extending locking projections.

6. A inet-al cap of relatively thin sheet inetal having a shallow depending doublewalled skirt having double walled corrugations, and double walled inwardly extending locking projections.

7. A nietal cap having a double walled skirt provided with double walled substantially closed inwardly projecting lugs having relatively Hat horizontal holding faces, and also provided with reinforcing corrugations in said double wall.

8. The method of making a sheet metal cap of relatively thin inetal, which consists in pressing a fiat blank into shape to form a top and a depending skirt, then subjecting the liange or skirt to pressure thereby to bend the lower edge thereof upon itself so as to substantially hug the skirt for a distance upward thereof to forni a double wall, and then subject-ing the skirt to pressure to provide such double wall with corrugautions and instruck locking projections.

Signed at Brooklyn, N. Y., this 2nd day of November, 1922. f

CHARLES HAMMER. 

